Date: Tue, 7 Jul 2009 18:46:39 +0200 From: Hans Petter Selasky <hselasky@c2i.net> To: Piotr =?iso-8859-2?q?Zi=EAcik?= <kosmo@semihalf.com> Cc: Rafal Jaworowski <raj@semihalf.com>, freebsd-arm@freebsd.org, thompsa@freebsd.org, freebsd-usb@freebsd.org Subject: Re: CPU Cache and busdma usage in USB Message-ID: <200907071846.42086.hselasky@c2i.net> In-Reply-To: <200907071550.28781.kosmo@semihalf.com> References: <200906231035.43096.kosmo@semihalf.com> <200907051236.22783.hselasky@c2i.net> <200907071550.28781.kosmo@semihalf.com>
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On Tuesday 07 July 2009 15:50:28 Piotr Zi=EAcik wrote: > > I did not find time yet to test on my AT91RM9200 board. I hope to do a > > test this week. Did you at semihalf find anything? > Hi, > I had Checked USB behaviour on PowerPC without hardware cache coherency. > The problem also exists here and patch helps. In my source code view the busdma sync function is empty for power-pc. Your= =20 patch should have no effect at all for sync operations? > > I also generated some logs which you asked for: Thanks. I will try to make a build for AT91RM9200 tonight. Did you test my suggested patch: > Try adding: > > cpu_dcache_wb_range((vm_offset_t)buf, len); > cpu_l2cache_wb_range((vm_offset_t)buf, len); > > Before: > > cpu_dcache_wbinv_range((vm_offset_t)buf, len); > cpu_l2cache_wbinv_range((vm_offset_t)buf, len); > > In: sys/arm/arm/busdma_machdep.c Or have you got any comments on that? =2D-HPS
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